The Kardashian sisters are at it again, making headlines in November and placing in the top 10 of the Celebrity Heat Index, which measures media exposure.

Look for the Heat Index in December to see if today's news that Catherine, the Duchess of Cambridge, is pregnant shakes things up on the list.

Here are the leading Hollywood newsmakers for November:

1. Kourtney Kardashian (430). Her reportedly stormy relationship with Scott Disick, father to her children, continues to be a popular subject for tabloid forecasting.

2. Justin Bieber (364). After reports of a breakup and then possible reunion between him and Selena Gomez, no one knows where things stand between them. His song lyrics "If I was your boyfriend" resonate.

3. Taylor Swift (339). When it comes to lyrics inspired by real-life events, she is the queen. Her latest album, Red, is released, and, as always, another of her short-lived relationships pays off.

5. Kristen Stewart (331). The final Twilight movie opens to box-office success as she and her leading man, Robert Pattinson, walk the red carpets appearing so happy together.

6. Khloe Kardashian (301).The X Factor co-host is subject to a tabloid storm as speculation rages on about her relationship with husband Lamar Odom.

7. Catherine, Duchess of Cambridge (287). Looks like speculation all month long about a baby bump watch being in order has come true with an announcement on Monday from the palace saying the duchess is expecting.

8. Robert Pattinson (274). See No. 5

9. Kim Kardashian (262). Reality TV star's personal life continues to trump her professional as far as headlines.